"caffe_gpu_set" should be "caffe_set" in line 125 and 139

[jnulzl]

@farmingyard Hello, I think "caffe_gpu_set" should be "caffe_set" in line 125 and 139 in conv_dw_layer.cpp
at the same time, "mutable_gpu_data" should "mutable_cpu_data"

caffe-mobilenet/conv_dw_layer.cpp

Line 125 in f7d7d13

caffe_gpu_set(weight_multiplier_.count(), Dtype(1), weight_multiplier_.mutable_gpu_data());